diff --git a/libavformat/rmenc.c b/libavformat/rmenc.c
index 6c05657..bba41b8 100644
--- a/libavformat/rmenc.c
+++ b/libavformat/rmenc.c
@@ -217,8 +217,8 @@ static int rv10_write_header(AVFormatContext *ctx,
                 coded_frame_size--;
             avio_wb32(s, coded_frame_size); /* frame length */
             avio_wb32(s, 0x51540); /* unknown */
-            avio_wb32(s, 0x249f0); /* unknown */
-            avio_wb32(s, 0x249f0); /* unknown */
+            avio_wb32(s, stream->enc->bit_rate / 8 * 60); /* bytes per minute */
+            avio_wb32(s, stream->enc->bit_rate / 8 * 60); /* bytes per minute */
             avio_wb16(s, 0x01);
             /* frame length : seems to be very important */
             avio_wb16(s, coded_frame_size);